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Date: Wed, 24 Jul 2013 11:00:37 -0700
From: Pravin B Shelar <pshelar@...ira.com>
To: netdev@...r.kernel.org
Cc: stephen@...workplumber.org, Pravin B Shelar <pshelar@...ira.com>
Subject: [PATCH net-next v3 2/6] vxlan: Extend vxlan handlers for openvswitch.
Following patch adds data and priority fields to vxlan handlers
and export vxlan handler api.
vh->data is required to store private data per vxlan handler.
vh->priority allows ovs to assign lower priority for ovs vxlan
handler. So that vxlan device modules gets to look at vxlan
packet before ovs.
Signed-off-by: Pravin B Shelar <pshelar@...ira.com>
---
drivers/net/vxlan.c | 83 +++++++++++++++++++++++++--------------------------
include/net/vxlan.h | 40 ++++++++++++++++++++++++
2 files changed, 81 insertions(+), 42 deletions(-)
create mode 100644 include/net/vxlan.h
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index f351b7c..9deb86e 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -41,13 +41,12 @@
#include <net/inet_ecn.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
+#include <net/vxlan.h>
#define VXLAN_VERSION "0.1"
#define PORT_HASH_BITS 8
#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
-#define VNI_HASH_BITS 10
-#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
#define FDB_HASH_BITS 8
#define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
#define FDB_AGE_DEFAULT 300 /* 5 min */
@@ -83,33 +82,14 @@ static int vxlan_net_id;
static const u8 all_zeros_mac[ETH_ALEN];
-/* per UDP socket information */
-struct vxlan_sock {
- struct hlist_node hlist;
- struct rcu_head rcu;
- struct socket *sock;
- struct hlist_head vni_list[VNI_HASH_SIZE];
- struct list_head handler_list;
-};
-
-struct vxlan_handler;
-typedef int (vxlan_rcv_t)(struct vxlan_handler *vh,
- struct sk_buff *skb, __be32 key);
-
-struct vxlan_handler {
- vxlan_rcv_t *rcv;
- struct list_head node;
- struct vxlan_sock *vs;
- atomic_t refcnt;
- struct rcu_head rcu;
- struct work_struct del_work;
-};
-
static struct vxlan_handler *vs_handler_add(struct vxlan_sock *vs,
__be16 portno,
- vxlan_rcv_t *rcv);
+ vxlan_rcv_t *rcv,
+ void *data,
+ int priority,
+ bool force_create);
+
static void vxlan_handler_hold(struct vxlan_handler *vh);
-static void vxlan_handler_put(struct vxlan_handler *vh);
/* per-network namespace private data for this module */
struct vxlan_net {
@@ -1342,7 +1322,7 @@ static int vxlan_init(struct net_device *dev)
struct vxlan_handler *vh;
/* If we have a socket with same port already, reuse it */
- vh = vs_handler_add(vs, vxlan->dst_port, vxlan_rcv);
+ vh = vs_handler_add(vs, vxlan->dst_port, vxlan_rcv, NULL, 0, false);
vxlan_vh_add_dev(vh, vxlan);
} else {
/* otherwise make new socket outside of RTNL */
@@ -1660,34 +1640,51 @@ static void vh_del_work(struct work_struct *work)
static struct vxlan_handler *vs_handler_add(struct vxlan_sock *vs,
__be16 portno,
- vxlan_rcv_t *rcv)
+ vxlan_rcv_t *rcv,
+ void *data,
+ int priority,
+ bool force_create)
{
- struct vxlan_handler *vh;
+ struct vxlan_handler *vh, *new;
/* Try existing vxlan hanlders for this socket. */
list_for_each_entry(vh, &vs->handler_list, node) {
if (vh->rcv == rcv) {
+ if (force_create)
+ return ERR_PTR(-EEXIST);
+
atomic_inc(&vh->refcnt);
return vh;
}
}
- vh = kzalloc(sizeof(*vh), GFP_KERNEL);
- if (!vh) {
+ new = kzalloc(sizeof(*new), GFP_KERNEL);
+ if (!new) {
vxlan_socket_del(vs);
return ERR_PTR(-ENOMEM);
}
- vh->rcv = rcv;
- vh->vs = vs;
- atomic_set(&vh->refcnt, 1);
- INIT_WORK(&vh->del_work, vh_del_work);
+ new->rcv = rcv;
+ new->vs = vs;
+ atomic_set(&new->refcnt, 1);
+ INIT_WORK(&new->del_work, vh_del_work);
+ new->data = data;
+ new->priority = priority;
- list_add_rcu(&vh->node, &vs->handler_list);
- return vh;
+ list_for_each_entry(vh, &vs->handler_list, node) {
+ if (vh->priority > priority) {
+ list_add_tail_rcu(&new->node, &vh->node);
+ return new;
+ }
+ }
+
+ list_add_tail_rcu(&new->node, &vs->handler_list);
+
+ return new;
}
-static struct vxlan_handler *vxlan_handler_add(struct net *net,
- __be16 portno, vxlan_rcv_t *rcv)
+struct vxlan_handler *vxlan_handler_add(struct net *net,
+ __be16 portno, vxlan_rcv_t *rcv,
+ void *data, int priority, bool force_create)
{
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
struct vxlan_handler *vh;
@@ -1704,25 +1701,27 @@ static struct vxlan_handler *vxlan_handler_add(struct net *net,
vh = ERR_PTR(-ENOENT);
goto out;
}
- vh = vs_handler_add(vs, portno, rcv);
+ vh = vs_handler_add(vs, portno, rcv, data, priority, force_create);
out:
mutex_unlock(&vn->sock_lock);
return vh;
}
+EXPORT_SYMBOL_GPL(vxlan_handler_add);
static void vxlan_handler_hold(struct vxlan_handler *vh)
{
atomic_inc(&vh->refcnt);
}
-static void vxlan_handler_put(struct vxlan_handler *vh)
+void vxlan_handler_put(struct vxlan_handler *vh)
{
BUG_ON(!vh->vs);
if (atomic_dec_and_test(&vh->refcnt))
queue_work(vxlan_wq, &vh->del_work);
}
+EXPORT_SYMBOL_GPL(vxlan_handler_put);
static void vxlan_vh_add_dev(struct vxlan_handler *vh, struct vxlan_dev *vxlan)
{
@@ -1746,7 +1745,7 @@ static void vxlan_handler_work(struct work_struct *work)
__be16 port = vxlan->dst_port;
struct vxlan_handler *vh = NULL;
- vh = vxlan_handler_add(net, port, vxlan_rcv);
+ vh = vxlan_handler_add(net, port, vxlan_rcv, NULL, 0, false);
vxlan_vh_add_dev(vh, vxlan);
dev_put(dev);
}
diff --git a/include/net/vxlan.h b/include/net/vxlan.h
new file mode 100644
index 0000000..5794bf7
--- /dev/null
+++ b/include/net/vxlan.h
@@ -0,0 +1,40 @@
+#ifndef __NET_VXLAN_H
+#define __NET_VXLAN_H 1
+
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/udp.h>
+
+#define VNI_HASH_BITS 10
+#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
+
+/* per UDP socket information */
+struct vxlan_sock {
+ struct hlist_node hlist;
+ struct rcu_head rcu;
+ struct socket *sock;
+ struct hlist_head vni_list[VNI_HASH_SIZE];
+ struct list_head handler_list;
+};
+
+struct vxlan_handler;
+typedef int (vxlan_rcv_t)(struct vxlan_handler *vh, struct sk_buff *skb, __be32 key);
+
+struct vxlan_handler {
+ vxlan_rcv_t *rcv;
+ struct list_head node;
+ void *data;
+ struct vxlan_sock *vs;
+ atomic_t refcnt;
+ struct rcu_head rcu;
+ struct work_struct del_work;
+ int priority;
+};
+
+void vxlan_handler_put(struct vxlan_handler *vh);
+
+struct vxlan_handler *vxlan_handler_add(struct net *net,
+ __be16 portno, vxlan_rcv_t *rcv,
+ void *data, int priority, bool force_create);
+
+#endif
--
1.7.1
--
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